Before the name
Machines learn to repeat themselves
Trance didn't start with Trance. It started when synthesizers and sequencers got cheap enough and stable enough that repetition stopped being a limitation and became a method. Kraftwerk, Tangerine Dream, Jean-Michel Jarre and Giorgio Moroder are the names most often cited for that shift, and they're cited because the records are still there to listen to.
The bridge onto club floors runs through rhythm-driven industrial and electronic body music. Front 242, Skinny Puppy and Nitzer Ebb were making machine music you could physically move to, in rooms that were closer to a club than a concert hall. None of these acts were making Trance. They were building the vocabulary something else would use.